Title :
Enhanced THz absorptance of metal surfaces structured with femtosecond laser
Author :
Vorobyev, Anatoliy Y. ; Topkov, Alexander N. ; Gurin, Oleg V. ; Svich, Vasily A. ; Guo, Chunlei
Author_Institution :
Inst. of Opt., Univ. of Rochester, Rochester, NY
fDate :
Sept. 29 2008-Oct. 4 2008
Abstract :
We show that THz absorptance of metals can be significantly increased by structuring the surface of metals with 1D array of parallel grooves produced by a scanning femtosecond laser beam. In our study, we enhance the absorptance of titanium up to 51% at wavelength of 70 mum (4.2 THz) even without optimization of the surface structure. This our finding shows that femtosecond laser surface structuring technology is suitable for creating highly absorptive metal materials for a variety of terahertz and submillimeter waves applications including terahertz spectroscopy, THz sensing, THz stealth technology, and space astronomy.
Keywords :
high-speed optical techniques; laser materials processing; submillimetre waves; surface structure; terahertz waves; titanium; 1D array; Ti; enhanced THz absorptance; highly absorptive metal materials; metal surfaces; scanning femtosecond laser beam; submillimeter waves; surface structuring technology; terahertz waves; wavelength 70 mum; Inorganic materials; Laser beams; Optical arrays; Optical materials; Space technology; Submillimeter wave technology; Surface emitting lasers; Surface structures; Surface waves; Titanium; absorptance; femrosecond laser; metals; terahertz radiation;
Conference_Titel :
Advanced Optoelectronics and Lasers, 2008. CAOL 2008. 4th International Conference on
Conference_Location :
Crimea
Print_ISBN :
978-1-4244-1973-9
Electronic_ISBN :
978-1-4244-1974-6
DOI :
10.1109/CAOL.2008.4671991
